Rotary drive apparatus for rewind mechanisms



Jan. 24, 1967 A. BARSAM, SR, ETA). 3,299,730

ROTARY DRIVE APPARATUS FOR REWIND MECHANISMS Filed June 22, 1964 2Sheets-Sheet 1 'INVENTORS ARTHUR BARSAMSA, ARTHUR BARSAM, Jfl,

BUM,%, 1% j ATTORNEYS,

Jan. 24, 1967 A. BARSAM, sR.. ET AL 3,299,730

ROTARY DRIVE APPARATUS FOR REWIND MECHANISMS Filed June 22, 1964 2Sheets-Sheet 2 I NVENTORS. ARTHUR BARsAMfl.

ARTHUR BARSAMJR,

am, Fuzz, @Aa

ATTORNEKS. 7

United States PatentOfiice Patented Jan. 24, 1967 3,299,730 ROTARY DRIVEAPPARATUS FOR REWINI) MECHANISMS Arthur Barsam, Sr., and Arthur Barsam,In, Los Angeles,

Calif, assignors to Cinex Inc., a corporation of California Filed June22, 1964, Ser. No. 376,706 14 Claims. (Cl. 74-421) The present inventionrelates to an improved rewind mechanism for winding motion picture film,sound track film, tapes and other ribbon-like materials from one reel toanother, and, more specifically, to a novel rotary drive particularlyuseful in rewind mechanisms.

Although many technical improvements have been made in the handling andprocessing of movie film, handoperated film rewinds have not changed inprinciple since the early days of silent films. They still comprise arelatively large driver gear and a small pinion gear journaled in anupright housing or frame. The drive gear is fixedly coupled to rotatewith a drive shaft while the pinion gear is coupled to aspindle-supporting shaft for receiving a film reel. The turning of thereel is controlled by a hand-operated crank on the drive shaft.

In the winding and rewinding of film, the rewinds are generally utilizedin pairs. The rewinds are secured to the top of a suitable work surfacea few feet apart with a film-loaded reel mounted on one rewind and anempty reel secured to the other. The end of the film of a loaded reel iscoupled to the empty reel. Then, by turning the hand crank of the emptyrewind, the film is transferred from the full to the empty reel. In thisoperation, it is the film which exerts a pulling or rotational drivingforce on the film-loaded reel. It is, therefore desired that thenecessary driving force be of a minimum value. To this end, conventionalrewinds provide means for axially moving the drive shaft with respect tothe reel shaft to separate the drive gear from the pinion gear of thefilm-loaded rewind. This allows the reels to rotate freely and rapidlywith a minimum of strain on the film and the operator.

If film is simply being transferred from one reel to another,conventional rewinds provide reasonably satisfactory operation. However,in film-editing, it is necessary to often selectively stop and reversethe direction of film travel. With conventional rewinds this presentsseveral basic problems. Before the direction of film travel can bereversed, the reels must be fully stopped. Otherwise, it is impossibleto re-engage the drive and pinion gears without clashing and grindingthe gears. If the reels are free-wheeling, separate braking means mustbe employed to stop the reels. Even after the reels are stationary, theoperator must very carefully slide the drive gear into engagement withthe pinion gear if excessive wear is to be avoided. This takes time andrequires the operator to exercise a degree of patience which in practiceis often forgotten in lieu of increased speed of film editing. Theresult, of course, is an undesired wearing of the drive and pinion gearswhich if repeated during periodic stop, start, and reverse operation ofthe film rewind materially shortens the useful life of the gears.

With the foregoing problems in mind, it is an object of the presentinvention to provide a rewind wherein the rotational drive couplingbetween the drive shaft and the pinion gear may be selectively andrapidly modified without clashing, grinding, or otherwise wearing thegears of the rewind.

It is another object of the present invention to provide a rewindwherein the rotational drive coupling between the drive shaft and thepinion gear may be selectively modified without axially moving the driveshaft, drive gear, or 'hand crank of the rewind.

A further object of the present invention is to provide a rewind whereinthe rotation drive coupling between the drive shaft and the pinion gearmay be modified While the gears of the rewind are rotating without anywearing of the gears.

A still further object of the present invention is to provide a rewindof the foregoing type wherein the apparatus for selectively modifyingthe rotational drive coupling of the drive shaft of the pinion gear iscapable of selectively stopping and starting rotation of the gears ofthe rewind as desired thereby eliminating the need for separate brakingmeans.

The foregoing as well as other objects and advantages of the presentinvention will be more clearly understood by reference to the followingdetailed description when considered with the drawings in which:

FIGURE 1 is a side view of one form of the rewind of the presentinvention;

FIGURE 2 is a sectional side view of the rotational drive apparatus ofthe rewind illustrated in FIGURE 1;

FIGURE 3 is a front view of the rotational drive assembly along the line3-3 in FIGURE 1; and

FIGURE 4 is a sectional view of a slightly modified rotational driveassembly for the rewind of FIGURE 1.

In the drawings, the rewind is represented generally by the numeral 8and includes an upright housing and supporting frame 10 having avertically extending main body portion 12 and opposing outwardly flangedbase sections or feet 14. The base sections 14 extend laterally from themain body portion 12 and including openings 16 for receiving bolts tosecure the rewind to a suitable work surface. As illustrated,intermediate and upper side portions 18, 20 and 24, 26 of the housing 10extend outwardly from the main body portion 12 and act as collars toprovide support for the journal members of a drive or crank shaft 22.

The spindle-supporting shaft 28 is hollow and receives the shank 30 of areel-receiving spindle 32. The spindle 32 supports a reel-spacing collar34 and a reel-driving key 36. Preferably, the spindle-supportingassembly is of the type described in US. Patent No. 2,939,643, issuedJune 7, 1960, under the title, Removable Spindle Rewind Mechanism, andis arranged to release the spindle 32 from locking engagement'within theshaft 28 by a quarter turn of a knurled knob 38 disposed at an oppositeend of the spindle-receiving shaft. 1

The shaft 28 also supports a pinion gear 39 (see FIG- URE 3). Thepiniongear 39 is fixed to the spindlesupporting shaft and makes drivingengagement with a relatively large drive gear 40. The drive gear 40 issupported for rotation around the drive shaft 22 within the housing 10.Rotation of the drive gear 40 produces rotation of the pinion gear 39and hence a similar rotation of the spindle-supporting shaft 28 to windfilm, or the like, onto a reel (not shown) supported by the spindle 32.

The rotation of the spindle-supporting shaft 28 is selectivelycontrolled by the rotary drive mechanism 44 of the present invention anda hand-operated crank 42 fastended to the exposed end of the drive shaft22. The hand crank 42 includes a rotatable crank arm 46 having anoutwardly extended handle 48 at one end and an enlarged section 50 atthe other end of suflicient weight to counterbalance the handle 48. Thecrank arm 46 is pin fastened at 52 to the drive shaft 22. Accordingly,rotation of the hand crank produces a corresponding rotation of thedrive shaft which, in turn, is selectively transmitted to thespindle-supporting shaft 28 by the rotary drive assembly 44.

In brief, the rotary drive assembly 44 includes the drive gear 40, apair of externally threaded sleeves 54 and 56, a pair of drive discs 58and 60 having internally threaded openings 62 and 64 engaging thethreaded sleeves 54 and 56, a pair of stop members 66 and 68 forlimiting relative movement between the drive gear 40 and the drive discs58 and 60, and a pair of drag or friction producing assemblies'70 and 72for inhibiting rotary movement of the drive discs 58 andv 60.

The drive gear40 is mounted for free rotational movement around thedrive shaft 22 bya ball bearing assembly 74 which includes a pluralityof ball bearings 76 disposed between an inner race 78 and an outer race80.

The inner race 78 is secured to and around the drive 1 shaft 22 whilethe outer race 80 is secured within a central opening 82 in the drivegear 40 around the inner race 78 by a pair of flat retaining rings 84and 86. The rings 84 and 86 extend around and overlap opposing ends ofthe opening 82 as well as the sides of the outer race 80 and are coupledtogether by a plurality of screws 88, passing through the drive gear 40.

The externally threaded sleeves 54 and 56 of the rotary drive assembly44 extend around the drive shaft 22 on opposite sides 90 and 92respectively, of the drive gear 40 and are secured to the drive shaft bypins 96 and 98. The threads 100 and 102 of the sleeves 54 and 56 have acommon pitch and when viewed from the right in FIGURE 2 screw inopposite directions toward the drive gear 40the thread 100 of the sleeve54 screwing in a counterclockwise direction and the thread 102 of thesleeve 56 screwing in a clockwise direction.

As illustrated in FIGURE 2, the threaded sleeves 54 and 56 receive andsupport the drive discs 58 and 60, respectively, around the drive shaft22. In particular, the drive discs 58 and 60 include central internallythreaded openings 62 and 64 which mate with the externally threadedsleeves 54 and 56 respectively. Accordingly, the drive disc 58 extendsradially from the drive shaft 22 adjacent the side 90 of the drive gear40 while the drive disc 60 extends radially from the drive shaftadjacent the side 92 of the drive gear.

In accordance with the present invention, rotation of the drive discs 58and 60 is inhibited by the friction or drag members 70 and 72 whichcontinuously engage and make sliding friction contact with the edges ofthe drive discs 58 and 60 respectively. As most clearly illustrated inFIGURE 2, the drag assembly 70 includes a block 104 of graphite or othersuitable friction material seated within a slot 106 in the housing 10.The block 104 includes a concave upper surface 108 for contacting theperiphery of the disc 58, and a pair of openings 110 and a lower surfacefor receiving coil springs 112. The coil springs extend verticallywithin the opening 110 and press against the bottom of the slot 106 tocontinuously urge the block 104 upwardly against the periphery of thedrive disc 58. The block 104 thus continuously exerts a drag force onthe drive disc 58 to retard rotary movement of the drive disc around thesleeve 54 and drive shaft 22.

The drag assembly 72 is similar to the drag assembly 70 and includes ablock 104' having a concave upper surface 108 continuously urged againstthe periphery of the drive disc 60 by a pair of coil springs 112. Thus,rotation of the drive disc 60 about the sleeve 56 and the drive shaft 22is continuously retarded by the block 104.

Since rotation of the drive discs 58 and 60 is inhibited by the dragassemblies 70 and 72, when the drive shaft 22 is initially rotated in aclockwise direction, the drive shaft 22 and the sleeves 54 and 56 turnwithin the openings 62 and 64 in the drive discs 58 and 60,respectively. The clockwise rotation of the sleeve 54 with the driveshaft screws the drive disc 58 axially along the drive shaft 22 towardthe drive gear 40 to engage the side 90 thereof.

' At the same time, the clockwise turning of the sleeve 56 with thedrive shaft 22 screws the drive disc 60 away from the drive gear 40.Similarly, when the drive shaft initially rotates in a counterclockwisedirection, the sleeve 56 turns within the threaded opening 46 in thedrive disc 60 to screw the drive disc 60 toward the drive gear 40 toengage the side 92 thereof while the counterclockwise turning of thesleeve 54 within the threaded opening 62 in the drive disc 58 screws thedrive disc 58 away from the drive gear 40. Thus, with rotation of thedrive shaft 22, one drive disc movesv to contact the drive gear 40while.the other drive disc moves away from the drive gear.

When, for example, the drive disc 58 engages the side of the drive gear40, contact plates 114 extending from the inner surface of the drivedisc bear tightly against the drive gear and create a strong, frictionaldrive coupling between the drive gear 40 and the drive disc 58.Parenthetically, the contact plates 114 may take the form of cork padsor pads of other suitable materials secured within correspondingrecesses 116 in the surfaces of the drive discs facing the drive gear byan adhesive extending through openings 118 leading to the recesses 116.

In any event, due to the strong friction coupling provided by thecontact plates, after the drive disc 58 has moved toward and engaged theside 90 of the drive gear 40 in response to clockwise rotation of thedrive shaft 22, further rotation of the drive shaft in the samedirection exerts a clockwise rotational force on the drive disc 58 whicheasily overcomes the drag forces associated with the drag member 70. Thedrive disc 58 then rotates in a clockwise direction with the drive shaft22 and carries the drive gear 40 in the same direction to impart rotarymovement to the pinion gear and spindle shaft 28. It should be notedthat while the drive disc 58 is rotating the drive gear 40 in aclockwise direction, the drive disc 60 is slightly separated from thedrive gear. i

A corresponding, yet opposite operation takes place when the drive disc60 has moved toward and engaged the side 92 of the drive gear 40 inresponse to counterclockwise rotation of the drive shaft 22. In thatcase, further rotation in the counterclockwise direction exerts acounterclockwise rotational force on the drive disc 60 which easilyovercomes the drag forces exerted by the drag assembly 72 on the drivedisc. The drive disc 60 then rotates in a counterclockwise direction andcarries the drive gear 40 in a counterclockwise direction to impartrotary movement to the pinion gear and spindle shaft 28. While the drivedisc 60 is rotating the drive gear 40 in a counterclockwise direction,the drive disc 58 is separated slightly from the drive gear 40.

As previously indicated, relative movement between the drive discs 58and 60 and the drive gear 40 is limited by the stop members 66 and 68.In particular, the stop members 66 and 68 limit the maximum displacementof the drive discs from the drive gear 40 and prevent the drive discfrom screwing off the threaded portions of the associated sleeves 54 and56.

To this end, the stop member 66 includes a collar portion 120 fixed tothe outer end surface of the sleeve 54 and an arm portion 122 extendingradially from the col lar portion 120. Thus, the stop member 66 issecured for rotation with the sleeve 54 and drive shaft 22. The arm 122lies adjacent the outer radial surface of the drive disc 58 and at itsouter end supports a pin member 126 which extends into one of aplurality of angularly spaced arc-shaped slots 128 in the drive disc 58.The stop member 66 is angularly disposed around the sleeve 54 relativeto the slot 128 such that the pin 126 (l) is adjacent an end 129 of theslot when the drive disc 58 engages the side 90 of the drive gear 40 todrive the gear in a clockwise direction, (2) travels along the slot in acounterclockwise direction as the drive disc 58 is screwed away from thedrive gear 40, and (3) engages the opposite end 130 of the slot when thedrive disc is completely separated from the drive gear and disposedalong the sleeve 54 at the end of the thread 100. Continuedcounterclockwise rotation of the drive shaft 22, sleeve 54, and stopmember 66, then produces a like rotation of the drive disc 58 as the pin126 presses against end 130 of the slot 128. Continued counterclockwiserotation of the drive shaft 22, etc., also produces a like rotation ofthe drive gear 40 since when the pin 126 engages the end 130 of the slot128, the drive disc 60 tightly engages the side 92 of the drive gear.

A similar arrangement exists for the stop member 68 which includes acollar portion 120' fixed to the outer end surface of the sleeve 56 andan arm portion 122' extend ing radially from the collar portion. Thus,the stop member 68 is secured for rotation with the sleeve 56 and thedrive shaft 22. The arm 122' lies adjacent the outer radial surface ofthe drive disc 60 and at its outer end supports a pin member 126' whichextends into one of a plurality of angularly spaced, arc-shaped slots128' in the drive disc 60.

Similar to the stop member 66, the stop member 68 is angularly disposedaround the sleeve 56 relative to'the slot 128 such that the pin 126' (l)is adjacent one end of the slot when the drive disc 60 engages the side92 of the drive gear 40 to drive the gear in a counterclockwisedirection, (2) travels along the slot 128' in a clockwise direction asthe drive disc 60 is screwed away from the drive gear 40, and (3)engages an opposite end of the slot 128 when the drive disc iscompletely separated from the drive gear and disposed along the sleeve56 at the end of the thread 102. Continued clockwise rotation of thedrive shaft 22, and the sleeve 56, and stop member 68, then produces alike rotation of the drive disc 60 as the pin 126' presses against theend of the slot 128. Continued clockwise rotation of the drive shaft 22,etc., also produces a like rotation of the drive gear 40 since when thepin 126' engages the end of the slot 128, the drive disc 58 tightlyengages the side 90 of the drive gear.

By way of summary and review, and starting with both drive discs 58 and60 separated slightly from the drive gear 40, and the drive shaft 22stationary, when it is desired to impart clockwise rotational movementto the drive gear and hence counterclockwise rotational movement to areel supported by the reel supporting shaft 28, the hand crank 46 isrotated in a clockwise direction. Initially, the drive discs 58 and 60are prevented from rotating by the drag members 70 and 72, respectively.Therefore, the initial rotation of the drive shaft 22 produces aclockwise rotation of the threaded sleeves 54 and 56 within the threadedopenings in the drive discs 58 and 60. The clockwise rotation of thesleeve 54 causes the drive disc 58 to move toward and tightly engage theside 90 of the drive gear 40 while the clockwise rotation of the sleeve56 causes the drive disc 60 to move away from the side 92 of the drivegear. When the drive disc 58 tightly engages the side 90 of thedrivegear 40, the pin 126' contacts the end of the slot 128 in the drivedisc 60. Continued clockwise rotation of the drive shaft 22 thenproduces a clockwise rotation of the drive disc 58 with the drive shaft22 and a similar rotation of the drive gear 40 and the drive disc 60.

When rotary movement of the drive shaft 22 is halted by stoppingrotation of the hand crank 42, the drive disc 58 continues to turn foran instant of time relative to the drive shaft 22. This causes the drivedisc 58 to back off slightly from the side 90 of the drive gear 40.Rotation of the drive disc 58 is then immediately halted by the frictioncontact between the drag member 70 and the edge of the drive disc.Similarly, rotation of the drive disc 60 is immediately halted by thedrag member 72. Both drive discs 58 and 60 as well as the drive shaft 22then remain stationary as the drive gear 40 continues to freely rotateabout the drive shaft to drive the spindlesupporting shaft 28 and thereel coupled thereto.

If it is desired to further increase the angular velocity of the reel orif, after a period of free-wheeling and slow down, it is desired toagain bring the reel up to speed, the hand crank 42 is simply rotatedagain in a 6 clockwise direction to move the drive disc 58 into drivingengagement with the drive gear 40. Continued clockwise rotation of thehand crank 42 then imparts further clockwise driving movement to thedrive gear 40 through the drive disc 58 as previously-described.

If it is desired to halt clockwise rotation of the drive gear 40, theclockwise rotation of the hand crank 42 is reversed. This produces animmediate reversal in the direction of rotation of the drive shaft 22carrying the threaded sleeves 54, 56. The threaded sleeves 54 and 56thus rapidly turn in a counterclockwise direction relative to theclockwise rotating drive discs 58 and 60. This produces a rapidseparation of the drive disc 58 from the side of the drive gear 40 andan immediate halting of rotation of the drive disc by drag members 70and 72. Continued counterclockwise rotation of the hand crank 42 anddrive shaft 22 produces counterclockwise travel of the threaded sleeves56 and 54 within the stationary drive discs 60 and 58, respectively.This causes the drive disc 60 to move toward and tightly engage the side92 of the drive gear 40 and the drive disc 58 to move further away fromthe side 90 of the drive gear until the pin 126 engages the end 130 ofthe slot 128. The pressure of the drive disc 60 against the moving side92 of the drive gear 40 produces a rapid stopping of the drive gear.Continued counterclockwise rotation of the drive shaft 22 and drive disc60 then causes the drive gear 40 to rotate in a counterclockwisedirection driving the pinion gear and spindle-supporting shaft in aclockwise direction.

As before,to disengage the drive shaft 22 and drive discs 58 and 60, therotation of the hand crank 42 is stopped. The drive disc 68 then movesaway from the side 92 of the drive gear 40 and rotation thereof isarrested by the drag member 72. -The drive gear 40, however, continuesto rotate in a counterclockwise direction without the stationary driveshaft 22 until such time as it is desired to stop rotation of the drivegear 40.

From the foregoing it will be appreciated that a rotary drive assemblyof the present invention provides means for selectively and rapidlymodifying the rotational drive coupling between the drive shaft 22 andthe pinion gear and spindle-supporting shaft of the rewind 8 without anyclashing, grinding or other wearing of the gears of the rewind. Further,the rotary drive assembly provides for selective modification of therotational drive coupling between the drive shaft and the pinion gearwithout requiring any axial movement of the drive shaft, drive gear orhand crank of the rewind. Moreover, the rotational drive couplingbetween the drive shaft and pinion gears of the rewind may be modifiedwhile the gears of the rewind are rotating. In addition, the rotarydrive assembly of the present invention provides for self-braking andstopping of the gears ofthe rewind without clashing or grinding of thegears and without requiring a separate braking means.

In the foregoing, a specific embodiment of the present invention hasbeen described in detail. Of course, variousmodifications may be made inthe specific structure without'departing from the spirit or scope of thepresent invention. As one example, the drag members 70 and 72 may bemodified to the form illustrated in FIGURE 4 as 70 and 72'.

As represented, the drag assembly 70' includes a plurality of angularlyspaced blocks 132 disposed within cup-shaped extensions 134 from theinner wall of the housing 10. The cup-shaped extensions 134 are radiallyspaced around the drive shaft 22 and provide sliding support for thecylindrical blocks 132. The blocks 132 are continuously urged outward toengage the outer surface of the drive disc 58 by a plurality of coilsprings 136, one stationed within each of the cup-shaped extensions 134.The blocks 132 exert a sufiicient friction force against the drive disc58 to maintain the drive disc stationary about the drive shaft 22 whilea drive disc is moving axially along the shaft toward and away from thedrive gear 40 between engagement with the drive gear and the point atwhich the pin 126 engages the end 130 of a slot 128 in the drive disc.As previously described, when the drive disc 58 engages the drive gear40, continued rotation of the drive shaft overcomes the frictiondeveloped by the blocks 132 on the side of the drive disc 58 to producea rotation of the drive disc and hence the drive gear 40. However, assoon as the drive shaftrztl stops, the friction developed by the blocks132 arrests the rotary movement of the drive disc 58.

A similar arrangement exists for the drag assembly 72 which includes aplurality of blocks 132 stationed Within a plurality of cup-shapedextensions 134' etxending from the left-hand wall of the housing 10.Coil springs 136 within the cup-shaped extensions 134' continuously urgethe blocks against the drive disc 60 to prevent rotation of the drivedisc 60 about the drive shaft 22 while the drive disc is moving axiallyalong the drive shaft between contact with the drive gear 40 and thepoint at which the pin 126 engages the end of the slot 128' in the drivedisc.

Accordingly, the modified rotary drive illustrated in FIGURE 4 functionsin the same manner as the previously described embodiment to selectivelyimpart and control the rotary movement of the drive gear 40.

We claim:

1. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said shaft for substantially freerotational movement about said shaft;

a drive member supported by said shaft adjacent said driven member;

cooperative means on said shaft and said drive member for moving saiddrive member along said shaft to engage said driven member in responseto rotary movement of said shaft in one direction and for moving saiddrive member away from said driven member in response to rotary movementof said shaft in an opposite direction such that rotary movement in saidone direction is imparted to said drive member and hence to said drivenmember when said drive member engages said driven member;

and means for inhibiting rotary movement of said drive member relativeto said shaft when said drive member turns in said opposite directionand when said drive member moves away from said driven member.

2. The combination of claim 1 wherein said means for inhibiting rotarymovement of said drive member includes friction producing meanscontinuously engaging said drive member.

3. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially freerotary movement around said shaft;

a first drive member supported by said shaft adjacent one side of saiddriven member;

7 a second drive member supported by said drive shaft adjacent anopposite side of said driven member; first cooperative means on saidshaft and first drive member for moving said first drive member alongsaid shaft to engage said one side of said driven member, in response torotary movement of said shaft in one direction and for moving said firstdrive member away from said driven member in response to rotary movementof said shaft in an opposite direction such that rotary movement in saidone direction is imparted to said first drive member and hence to saiddriven member when said first drive member engages said driven member;

and second cooperative means on said shaft and said second drive memberfor moving said second drive member along said shaft to engage saidopposite side of said driven member in response to rotary movement ofsaid shaft in said opposite direction and for moving said second drivemember away from said driven member in response to rotary movement ofsaid shaft in said one direction such that rotary movement in saidopposite direction is imparted to said second drive member and hence tosaid driven member when said second drive member engages said drivenmember.

10 4. The rotary drive mechanism of claim 3 including means coupled tosaid shaft for limiting movement of said first and second drive membersaway from said driven member.

5. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially freerotary movement around said shaft;

a first drive member supported by said shaft adjacent one side of saiddriven member and including a slot I radially spaced from said driveshaft;

a second drive member supported by said drive shaft adjacent an oppositeside of said driven member and including a slot radially spaced fromsaid drive shaft;

finger supporting means extending from said drive shaft into said slotsin said first and second drive members for limiting relative rotarymovement between said shaft and said first and second drive members;

first cooperative means on said drive shaft and said first drive memberfor moving said first drive member along said drive shaft to engage saidone side of said driven member in response to rotary movement of saiddrive shaft in one direction and for moving said first drive member awayfrom said driven member in response to rotary movement of said driveshaft in an opposite direction such that rotary movement in said onedirection is imparted to said first drive member and hence to saiddriven member when said first drive member engages said driven member;

and second cooperative means on said drive shaft and said second drivemember for moving said second drive member along said drive shaft toengagesaid opposite side of said driven member in response to rotarymovement of said drive shaft in said opposite direction and for movingsaid second drive member away from said driven member in response torotary movement of said drive shaft in said one direction such thatrotary movement in said opposite direction is imparted to said seconddrive member and hence to said driven member when said second drivemember engages said driven member.

6. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially freerotary movement around said shaft;

a first drive member supported by said shaft adjacent one side of saiddriven member; I

a second drive member supported by said drive shaft adjacent an oppositeside of said driven member;

first cooperative means on said shaft and first drive member for movingsaid first drive member along said shaft to engage said one side of saiddriven member in response to rotary movement of said shaft in onedirection and for moving said first drive member away from said drivenmember in response to rotary movement of said shaft in an oppositedirection such that rotary movement in said one direction is imparted tosaid first drive member and hence to said driven member when said firstdrive member engages said driven member;

second cooperative means on said shaft and said second drive member formoving said second drive member along said shaft to engage said oppositeside of said driven member in response to [rotary movement of said shaftin said opposite direction and for moving said second drive member awayfrom said driven member in response to rotary movement of said shaft insaid one direction such that rotary movement in said opposite directionis imparted to said second drive member and hence to said driven memberwhen said second drive member engages said driven member;

and means for inhibiting rotary movement of said first and second drivemembers when said drive shaft turns in said opposite and in said firstdirections, respectively, relative to said driven member and when saiddrive members move away from said driven member.

7. The rotary drive mechanism of claim 6 including a housing forsupporting said drive shaft for rotary movement about its longitudinalaxis and wherein said first and second drive members are disc-shaped andsaid means for inhibiting rotary movement of said first and second drivemembers each include a drag member having a concave surface for engagingthe periphery of a disc-shaped drive member and spring means extendingbetween said drag member and said housing for continuously urging saiddrag member against said disc-shaped drive member.

8. The rotary drive mechanism of claim 6 including a housing forsupporting said drive shaft for rotation about its longitudinal axis andwherein said means for inhibiting rotary movement of said first andsecond drive members each include a drag member having a substantiallyfiat surface for contacting the side of a drive member remote from saiddriven member and spring means extending be tween said drag member andsaid housing for continuously urging said drag member against said drivemember.

9. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially freerotary movement around said shaft;

a first screw means around said shaft adjacent one side of'said drivenmember;

a first drive member having a threaded opening mating with said firstscrew means for movement along said shaft to engage and disengage saidside of said driven member with rotation of said shaft within saidthreaded opening in first and second directions, respectively, such thatsaid first drive member and said driven member rotate in said firstdirection when said first drive member engages said driven member;

a second screw means around .said shaft adjacent an opposite side ofsaid driven member;

a second drive member having a threaded opening mating with said secondscrew means for movement along said shaft to engage and disengage saidopposite side of said driven member with rotation of said shaft withinsaid opening in said second drive member in said second and said firstdirections respectively, such that said second drive member and saiddriven member rotate in said second direction when said second drivemember engages said driven member;

and means for inhibiting rotary movement of said first and second drivemembers relative to said drive shaft as said drive shaft turns in saidsecond and first directions, respectively, relative to said drivenmember thereby causing said first and second screw means to drive saidfirst and second drive members axially along said drive shaft away fromsaid driven member.

10. The rotary drive mechanism of claim 9 including means for limitingmovement of said first and second drive members away from said drivenmember.

11. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially freerotary movement around said shaft;

a screw means around said shaft adjacent one side of said driven member;

a drive member having a threaded opening mating with said screw meansfor movement :along said shaft to engage and disengage said side of saiddriven member with rotation of said shaft within said threaded openingin first and second directions, respectively, such that said drive anddriven members rotate in said first direction when said drive memberengagessaid driven member;

and means for inhibiting rotation of said drive member relative to saiddrive shaft as said drive shaft turns in said second direction relativeto said driven member thereby causing said screw means to drive saiddrive member axially along said drive shaft away from said drivenmember.

12. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially freerotary movement around said shaft;

a first screw means around said shaft adjacent one side of said drivenmember;

a first drive member having a threaded opening mating with said firstscrew means for movement along said shaft to engage and disengage saidside of said driven member with rotation of said shaft within saidthreaded opening in first :and second directions, respectively, suchthat said first drive member and said driven member rotate in said firstdirection when said first drive member engages said driven member;

a second screw means around said shaft adjacent an opposite side of saiddriven member;

and a second drive member having a threaded opening mating with saidsecond screw means for movement along said shaft to engage and disengagesaid opposite side of said driven member with rotation of said shaftwithin said opening in said second drive member in said second and saidfirst directions respectively, such that said second drive member andsaid driven member rotate in said second direction when Isjaid seconddrive member engages said driven memer.

13. A rewind mechanism, comprising:

a housing;

a drive shaft supported by said housing for rotary movement about itslongitudinal axis;

a hand crank coupled to said drive shaft for rotating said drive shaft;

a driven shaft supported by said housing in a plane substantiallyparallel to said drive shaft :for rotary movement about its longitudinalaxis, said driven shaft being adapted to support a reel;

a drive gear supported by said drive shaft for substantially free rotarymovement around said drive shaft;

a driven gear coupled for rotation with said driven shaft, said driven[gear mating with said drive gear such that rotation of said drive gearrotates said driven gear and driven shaft;

a first drive member supported by said shaft adjacent one side of saiddrive gear;

a second drive member supported by said drive shaft adjacent an oppositeside of said drive gear;

first cooperative means on said drive shaft and said first drive meansfor moving said first drive member along said drive shaft to engage saidone side of said drive gear in response to rotary movement of said handcrank and drive shaft in one direction and for moving said first drivemernber away from said drive gear in response to rotary movement of saidhand crank and drive shaft in an opposite direction such that rotarymovement in said one direction is imparted to said drive gear when saidfirst drive member engages said drive gear;

second cooperative means on said drive shaft for moving said seconddrive member along said drive shaft to engage said opposite side of saiddrive gear in response to rotary movement of said drive shaft in saidopposite direction and for moving said second drive member away fromsaid drive gear in response to rotary movement of said drive shaft insaid one direction such that rotary movement in said opposite directionis imparted to said drive gear when said second drive member engagessaid drive gear;

friction means supported by said housing for inhibiting rotation of saidfirst and second drive members;

and means supported by said drive shaft for limiting movement of saidfirst and second drive members away from said drive gear.

14. A rewind mechanism, comprising:

a housing;

a drive shaft supported by said housing for rotary movement about itslongitudinal axis;

a hand crank coupled to said drive shaft for rotating said drive shaft;

a driven shaft supported 'by said housing in a plane substantiallyparallel to said drive shaft for rotary movement about its longitudinalaxis, said driven shaft being adapted to support a reel;

a drive gear supported :by said drive shaft for substantially freerotary movement around said drive shaft;

a driven gear coupled for rotation with said driven shaft, said drivengear mating with said drive gear such that rotation of said drive gearrotates said driven gear and driven shaft;

a first screw means around said drive shaft adjacent one side of saiddrive gear;

a second screw mean-s around said drive shaft adjacent an opposite sideof said drive gear;

a first drive disc having a threaded opening mating with said firstscrew means for movement along said drive shaft to engage and disengagesaid side of said drive gear with rotation of said drive shaft withinsaid threaded opening in first and second directions, respectively, suchthat said first drive disc and drive shaft rotate in said firstdirection when said first drive disc engages said drive gear;

a second drive disc having a threaded opening mating with said secondscrew means for movement along said drive shaft to engage and disengagesaid opposite side of said drive gear with rotation of said drive shaftwithin said opening in said second drive disc in said second and saidfirst directions, respectively, such that said second drive disc andsaid drive gear rotate in said second direction when said second drivedisc engages said drive gear;

friction means supported by said housing for inhibiting rotation of saidfirst and second drive discs;

and means supported by said drive shaft for limiting movement of saidfirst and second drive disc's away from said drive gear.

References Cited by the Examiner UNITED STATES PATENTS 824,805 7/ 1906Muller 19294 X 860,590 7/ 1907 Williams 19294 X 1,254,180 1/1918 Ward'19-2-43 1,833,648 11/1931 Johnson 74-421 X 1,899,660 2/1933 Becker192-19 2,507,640 5/ 195 0 Macdonald 74-337 X 2,699,854 1/1955 Trout19231 X 3,158,244 11/196'4 L-anigan et a1 192-94 X DAVID J.WILLIAMOWSKY, Primary Examiner.

L. H. GERIN, Assistant Examiner.

13. A REWIND MECHANISM, COMPRISING: A HOUSING; A DRIVE SHAFT SUPPORTEDBY SAID HOUSING FOR ROTARY MOVEMENT ABOUT ITS LONGITUDINAL AXIS; A HANDCRANK COUPLED TO SAID DRIVE SHAFT FOR ROTATING SAID DRIVE SHAFT; ADRIVEN SHAFT SUPPORTED BY SAID HOUSING IN A PLANE SUBSTANTIALLY PARALLELTO SAID DRIVE SHAFT FOR ROTARY MOVEMENT ABOUT ITS LONGITUDINAL AXIS,SAID DRIVEN SHAFT BEING ADAPTED TO SUPPORT A REEL; A DRIVE GEARSUPPORTED BY SAID DRIVE SHAFT FOR SUBSTANTIALLY FREE ROTARY MOVEMENTAROUND SAID DRIVE SHAFT; A DRIVEN GEAR COUPLED FOR ROTATION WITH SAIDDRIVEN SHAFT, SAID DRIVEN GEAR MATING WITH SAID DRIVE GEAR SUCH THATROTATION OF SAID DRIVE GEAR ROTATES SAID DRIVEN GEAR AND DRIVEN SHAFT; AFIRST DRIVE MEMBER SUPPORTED BY SAID SHAFT ADJACENT ONE SIDE OF SAIDDRIVE GEAR; A SECOND DRIVE MEMBER SUPPORTED BY SAID DRIVE SHAFT ADJACENTAN OPPOSITE SIDE OF SAID DRIVE GEAR; FIRST COOPERATIVE MEANS ON SAIDDRIVE SHAFT AND SAID FIRST DRIVE MEANS FOR MOVING SAID FIRST DRIVEMEMBER ALONG SAID DRIVE SHAFT TO ENGAGE SAID ONE SIDE OF SAID DRIVE GEARIN RESPONSE TO ROTARY MOVEMENT OF SAID HAND CRANK AND DRIVE SHAFT IN ONEDIRECTION AND FOR MOVING SAID FIRST DRIVE MEMBER AWAY FROM SAID DRIVEGEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID HAND CRANK AND DRIVE SHAFTIN AN OPPOSITE DIRECTION SUCH THAT ROTARY MOVEMENT IN SAID ONE DIRECTIONIS IMPARTED TO SAID DRIVE GEAR WHEN SAID FIRST DRIVE MEMBER ENGAGES SAIDDRIVE GEAR; SECOND COOPERATIVE MEANS ON SAID DRIVE SHAFT FOR MOVING SAIDSECOND DRIVE MEMBER ALONG SAID DRIVE SHAFT TO ENGAGE SAID OPPOSITE SIDEOF SAID DRIVE GEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID DRIVE SHAFT INSAID OPPOSITE DIRECTION AND FOR MOVING SAID SECOND DRIVE MEMBER AWAYFROM SAID DRIVE GEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID DRIVE SHAFTIN SAID ONE DIRECTION SUCH THAT ROTARY MOVEMENT IN SAID OPPOSITEDIRECTION IS IMPARTED TO SAID DRIVE GEAR WHEN SAID SECOND DRIVE MEMBERENGAGES SAID DRIVE GEAR; FRICTION MEANS SUPPORTED BY SAID HOUSING FORINHIBITING ROTATION OF SAID FIRST AND SECOND DRIVE MEMBERS; AND MEANSSUPPORTED BY SAID DRIVE SHAFT FOR LIMITING MOVEMENT OF SAID FIRST ANDSECOND DRIVE MEMBERS AWAY FROM SAID DRIVE GEAR.